A.C. susceptibility as a probe of low-frequency magnetic dynamics
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The experimental technique of a.c. susceptibility can be used as a probe of magnetic dynamics in a wide variety of systems. Its use is restricted to the low-frequency regime and thus is sensitive to relatively slow processes. Rather than measuring the dynamics of single spins, a.c. susceptibility can be used to probe the dynamics of collective objects, such as domain walls in ferromagnets or vortex matter in superconductors. In some frustrated systems, such as spin glasses, the complex interactions lead to substantial spectral weight of fluctuations in the low-frequency regime, and thus a.c. susceptibility can play a unique role. We review the theory underlying the technique and magnetic dynamics more generally and give applications of a.c. susceptibility to a wide variety of experimental situations.
Topping , C V & Blundell , S J 2018 , ' A.C. susceptibility as a probe of low-frequency magnetic dynamics ' , Journal of Physics: Condensed Matter , vol. 31 , no. 1 , 013001 . https://doi.org/10.1088/1361-648X/aaed96
Journal of Physics: Condensed Matter
© 2018, IOP Publishing Ltd. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1088/1361-648X/aaed96
DescriptionWe are grateful to EPSRC (UK) for financial support.
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